If the announced values are static, it is advised to set run_once: True
(do not poll) on the beacon configuration.

The following are required configuration settings:

'servicetype': The service type to announce.
'port': The port of the service to announce.
'txt': The TXT record of the service being announced as a dict.

Grains can be used to define TXT values using the syntax:

grains.<grain_name>

or:

grains.<grain_name>[i]

where i is an integer representing the index of the grain to
use. If the grain is not a list, the index is ignored.

The following are optional configuration settings:

'servicename': Set the name of the service. Will use the hostname from

__grains__['host'] if not set.

'reset_on_change': If true and there is a change in TXT records

detected, it will stop announcing the service and
then restart announcing the service. This
interruption in service announcement may be
desirable if the client relies on changes in the
browse records to update its cache of the TXT
records.
Defaults to False.

'reset_wait': The number of seconds to wait after announcement stops

announcing and before it restarts announcing in the
case where there is a change in TXT records detected
and 'reset_on_change' is True.
Defaults to 0.

'copy_grains': If set to True, it will copy the grains passed into

the beacon when it backs them up to check for changes
on the next iteration. Normally, instead of copy, it
would use straight value assignment. This will allow
detection of changes to grains where the grains are
modified in-place instead of completely replaced.
In-place grains changes are not currently done in the
main Salt code but may be done due to a custom
plug-in.
Defaults to False.